A cobposatioh



Aug. 20, 1929. E. A. ROCKWELL FUEL FEEDING APPARATUS OPERATED BYPRESSURE I Original Filed Aug. 2, 1925 5 Sheets-Sheet l Aug. 20, 1929 E.A. ROCKWELL 1,725,210

FUEL FEEDING APPARATUS OPERATED BY PRESSURE Original Filed Aug. 2, 1923s Sheets-Sheet 2 In f.

Aug. 20, 1929. E. A. R OCKWELL 1,725,210 FUEL FEEDING APPARATUS OPERATEDBY PRESSURE original Filed Aug. 2, 192 3 3 Sheets-Sheet 5 Patented Aug,29, R929.

tlhliiffil) STATES E TENT 'EDYVARD A. RQOIKWELL, OF NEW YORK, N. Y.,ASSIGNOR T STEVIART-VTARNER COR- PORATEON, OF CHICAGO, ILLINOIS, ACQRPORA'I'ION 0F VIRGINIA.

FUEL-FEEDII TG APPABATUS OPERATED BY PRESSURE.

Application filed August 2, 1923, Serial No. 655,236. Renewed December26, 1925.

My invention relates particularly to an apparatus designed for feedingfuel to internal combustion engines with the aid of pressure and hasrelation to the feeding of fuel to internal combustion engines of manydifferent 'kinds although it is particularly adapted for use inconnection with automobile engines.

The purpose of this construction is to provide an improved constructionfor supplying fuel to an internal combustion engine, utilizing formoving the fuel from a lower and relatively distant source to thecarbureter the al ternation of pressure and suction in any one cylinderof the engine, and particularly utilizing the rise and decline of thesuction in each cycle of the engine action. It consists in the elementsand features of construction shown and described as indicated in theclaims.

While my invention is capable of being embodied in many different formsfor the purpose of illustration 1 have shown certain forms of the samein the accompanying drawings, in which- Figure l is an elevation of anengine equipped with an appartus operating in accordance with myinvention; 7

Figure 2 is a vertical section of the chamber therein from which li uidfuel is forced;

Figure 3 is a vertical section of a controlling and limiting devicelocated in the connection between said chamber and the cylinder; I

Figure 4; is a horizontal section of acooling device which may belocated in the connection between the said chamber and the cylinder;Figure 5 is a vertical section of a modified form of controlling devicefor use in connection with my invention;

Figures 6 and 7 are longitudinal sectional views taken respectively onlines 6-6' and 77 of Figure 8 and illustrating a modified form of fuelfeeding chamber, and

Figure 8 is a plan view of the chamber shown in Figures 6 and 7. V

In the drawings, referring first to Figures 1 to 4, I have shown anautomobile engine 1 comprising a plurality of cylinders 2 havingpetcocks '3 and spark plugs l therein. The engine is shown as having theusual inlet manifold 55, carburetor 6, fan 7, crank case 8, gear case 9and transmission shaft 10. In one of thecylinders, instead of a petcock,there is a means provided for taking off pressure from the cylinder,comprising (in the embodiment shown in Figures 1 to i) a connection 11which is preferably in the form of a cooling device having a pluralityof vertical radiating fins 12, the cooling device being made out ofmetal or any other desired heatconducting material. To the coolingdevice 11 there is connecteda short tube 13 preferably made of a smallbore tubing with thick walls which leads to a pressure regulating device14- to which it is connected by any desired form of coupling 15. Thedevice 14 has at the upper portion thereof a bowed cover plate 16 whichis connected by means of screws 17 to a main housing 18 in the upper endof which there is a circular shallow chamber 19 of comparatively largediameter. The chamber 19 is arranged to receive a disc 20 preferablyhaving a flange 21 which is carried loosely within the chamber 19. Thedisc 20 is of substantially the same shape as the body cover 16, thelatter being provided with a number of depressions 22 to act as stopsand thus prevent the disc 20 from fitting tightly against the surface ofthe cover .16. In this way the gaseous pressure is exerted over a largearea. The disc 20 is secured in any desired way to the top of a mainvalve 23 having a conical surface 24: which fits against a similarlyshaped hollow conical surface 25 on a secondary valve 2-6. The mainvalve 23 is, furthermore, provided with an annular recess 2? whichcommunicates with a plurality of holes 28 leading to an internalcylindrical chamber 29 within the same. Within the chamber 29 there isreceived the upper end of a stiff spring 30, the lower portion of whichfits over the upper end of an adjusting screw 81 arranged to passthrough a stufiing box 32 which is screwthreaded on the lower portion ofa screwcap 33 in which the screw 31 is rotatably screw-threaded. The cap38, furthermore, supports a light spring 34:, the upper end of whichcontrols the position of the secondary valve 26. It will be noted fromFigure 3 that the secondary valve 26 has at its lower portion a circularflange 35 of such a size as to leave a space between the same and theinterior wall of the housing 18 and that above the flange 35 there is aconical surface 36 which cooperates with a valve seat 37 formed on theinterior wall of the housing 1.8, beyond which on the valve 26 there isan annular recess 38 to permit the passage of gases from the housing 18out through a passageway 39 when the valve 26 1s unseated There is,furthermore, provided, leading inlOO to the chamber 19, a valve chamberto receive a vertlcally removable venting valve 41 having four radiatingribs 42 to support it in uprightposition and a conical valve surface 1in communication with the tube 48. lVithin' the chamber 51 there isprovided a float 52 made of cork or balsa wood or hollow metal, etc., tothe upper side of which there is secured a valve disc 53 of metalattached to the float by means of a wire or rod 54 passing through thesame. The valve disc 53 cooperates with a valve seat 55 provided uponthe casting 50 at the upper end of the chamber 51. At its lower end thechamber 51 has screw-threaded into the same a casting 56 on the interiorof which there is a screen 57 in the form of a disc retained in place bya split ring 58 arranged to be received in a recess 59 in the casting56. The

upper portion of the casting 56 has a flat valve seat 60 cooperatingwith a disc valve 61, the upward movement of which is limited by aremovable cage 62 having inwardly and downwardly directed stops 62 and,at the lower side of the cage, spring flange members 62 fitting againstan outwardly flared shoulder 62 on the casting 56 extending around theinterior of an enlarged circular chamber 63 situated below the chamber51. At its lowermost portion the casting 56 has a screwthreadedpassageway 64 communicating with the screen 57 and the valve 61, thesame being arranged to receive a screw-threaded fitting 65 connected byany desired form of coupling member 66 to a tube 67 leading rearwardlyand upwardly to a coupling 68 by means of which it is connected to atube 69 passing downwardly into a main fuel reservoir 70 to a point nearthe bottom thereof, the reservoir 70 having the usual ventedscrew-filling cap 71. It will be noted that, in this embodiment of theinvention, the liquid forcing means 50 is preferably locatedsubstantially midway between the engine and the fuel reservoir 70 at apoint opposite to the gear case 9 and at a level somewhat lower than thelevel of the main fuel reservoir 70. In this way the amount of tubingrequired for installing the apparatus is reduced to a minimum and at thesame time the requirements for the filling of the chamber 51 under allconditions of operation are fulfilled. That is to say the liquid forcingmeans 50 will readily receive its repeated charges of gasolene from thereservolr 70 either by gravity or by the application of only a verysmall degree of vacuum although it is to be understood that the locationof the parts in this way is not essential, inasmuch as it will bereadily understood that, although a slight vacuum causes the pipe 67 toact as a siphon once the liquid starts to flow therethrough,nevertheless instead the connection from the reservoir 7 O to thechamber 51 may be as shown in dotted lines in Figure 1, in which eventtie liquid would flow merely by gravity from the reservoir 7 O to thechamber 51. The liquid within the chamber 51 is conveyed out of the sameunder the influence of the pressure exerted therein through a checkvalve 72 having guiding ribs73 which valve seats against a valve seat 74on a hollow screw-plug 75 screwthreaded into an extension 76 on theliquid forcing means 50. At the top of the extension 76 there isscrew-threaded into the same a screw-fitting 77 which is connected byany suitable kind of coupling 78 to a tube or the like 79 leading to thebottom of a float chamber 80 of the carburetor 6.

In the modification of my invention shown in Figure 5 I have shown amodified form of regulating device which is intended to be used in theapparatus .if desired in the place of the device 14. This is comprisedof a tubular portion 81 arranged to be screwed direct ly into thecylinder, a hexagonal surface 82 being pr vided to receive a Wrench forthis purpose. The tubular portion 81 has at its upper end a restriction83 to decrease'the.

flow of gases through the same. At this point the tubular portion 81 hasa screw thread 84 to be received in a main housing 85 having an enlargedchamber 86 therein. Within the chamber 86 there is a disc shaped valve87 shaped to form an annular valve seat 88 at its upper edge and seatingagainst a number of PIOJGCtlOIlS 89 to prevent the valve from entirelyseating against the sur- Communicating with noted that this passageway90 has its outlet 7 with the passageway 94. lhe outermost end of thecylindrical retainer 97 has been provided with a passageway 99 to permitthe escape of excess quantities of the gaseous medium which eventuallypass out through an opening 100 in an adjusting collar 101 provided witha notched flange 102 held in its adjusted position by means of a springarm 103 secured to the housing 85 by means of a screw 104.

In the operation of my invention, referring to Figures 1 to 1,immediately that the engine is turned over the compression of the gasesin the cylinder to which the tube 13 is connected will be conveyedthrough the controlling and limiting device lt around the disc 20through the passageways 27, 28 and 29 to the chamber 51 where thepressure thus exerted upon the liquid within the chamber 51 will causethe same to be forced past the check valve 72 through the tube 79 to thefloat chamber 80 of the carburetor. The pressure thus applied to thedisc 20 will cause the main valve 23 to become seated entirely on thecompression stroke of the engine piston. Upon the release of thispressure by the movement of the piston in the opposite direction thechamber 51 will become vented due to the unseating of the venting valve10 which admits a column of air to the connections between the chamber51 and the engine cylinder. The venting of the connections in this way,however, permits the chamber 51 to receive again a further charge of theliquid fuel from the reservoir 70 which passes into the chamber 51around the plate valve 61, the check valve 72 being seated during thisfilling operation.

Upon the next pressure stroke of the piston in the engine cylinder orupon the next occurrence of the pressure conditions within the enginecylinder the column of air which has been drawn into the'conn'ectionsthrough the valve 40 and fed into the tube 13 will then be forced in theopposite direction through the connections as before described, andafter the valve 40 has become seated so as to apply the column ofgaseous medium thus drawn from the air to the body of fuel withinthechamber 51 and again force the charge therein in the direction of thecarburetor as previously described. It will be understood that duringthe feeding operations in this way the chamber 51 will-supply liquid tothe float chamber 80 of the carburetor only until the pressure of thefloat valve within said chamber 80 prevents the further feeding of theliquid in this way, whereupon the accumulation of liquid within thechamber 51 will cause the float 52 to rise and seat the valve 53 thereinthus preventing the further flow of liquid from the reservoir into thechamber 51. Also it will be understood that in the case of theaccumulation of any more pressure than is needed for the operation ofthe apparatus as, for example, beyond the pressures which can becontrolled by the float valve in the carburetor 6 or such as wouldexceed the pressures required to merely feed the liquid out of thechamber 51, conditions which might occur in the case of the operation ofthe engine at very high speed under a full load, the disc valve 20 willmove downwardly more quickly, causing the edge of the flange of thedished disk to be approximately seated as seen in Figure 3 and therebyto restrict the access of pressure at an earlier stage in thecompression stroke than when the engine speed is less and the enginepressure correspondingly less. And it will be understood also that asthe pressure rises in each pressure phase of the engines action, thelimited clearance for pressure to pass around the flange of the disk,20, causes the pressure above the disk to become considerably in excessof that below it and operates at high engine speed and consequent highpressure in the compression stroke to force the disk down until itsperiphery is actually seated on the lower side of the chamber, 19; andthe engine pressure by that time attained is thus cut off and preventedfrom reaching the fuel chamber, 50; while at the same time the secondaryvalve, 26, is opened and vents the excess pressure which will havepassed the disk before it became thus seated. It will be un derstoodthat by providing for a large surface upon the disc 20 the effects ofany pressure changes within the interior of the system are greatlylessened so as to provide a very effective and positive control for thesame. Furthermore, by constructing the parts in this way, the upwardmovementof the disc 20 is not controlled by the extent of any vacuumwithin the apparatus but by the force of the reaction of the stifispring 30 which stores up the energy received from the compressionimpulse transmitted from the engine cylinder. In this way not only isthe degree of pressure transmitted to the fuel forcing means controlledin the ordinary operation ofthe apparatus but the presence of any largeexcess of pressure is absolutely prevented by the eutting off of thepressure entirely when this condition occurs.

I The operation of my invention, as shown in Figure 5, in substantiallythe sameas the operation described hereinabove. However, in theoperation of this form of my invention the following features may beemphasized: In this instance in the operation of the apparatus thepressure conveyed to the tubular portion 81 is transmitted to the largearea of the disc valve 87 and after a momentary transmission of thepressure to the liquid fuel through the passageway 90 the furtherapplication of pressure is cut oil by the seating of the disc valve 87against the upper portion of the chamber 86 and when this has occurredthe valve 92 will have been opened, thus venting the passageway 90 and.the conduits connected thereto to the air and permitting the escape ofpressure which has been accumulated therein. Upon the suction stroke ofthe en ine piston the valve 92 will again become seated thus againbringing into communication the tubular portion 81 and the passageway90. The effect of this will be not only to draw the gaseous mediumsupplied from the outer air into the system but also at the same time toassist in breaking the pressure within the conduits connected to thepassageway 90 thus permitting the filling of the feeding apparatus withliquid. In this way it will be noted that the gaseous medium fed intothe passageway 90 and the conduits connected thereto is the body of airbrought into the apparatus, and that furthermore inasmuch as thepressure is quickly cut off by the disc valve 87 the heating of theapparatus to any considerable degree is avoided. Furthermore, althoughthe disc valve 87 will cut off the pressure early in the compressionstroke of the engine the point in which this takes place may be readilyregulated by changing the position of the adjusting collar 101 whichwill remain in its adjusted position owing to the presence of the springarm 103.

The operation of the modified form of my invention shown in Figure 5 issubstantially the same as described in connection with a previous formof my invention. In this instance, however, the valve 92 serves thepurpose of venting the chamber 51 and also relieves any excess pressurewhich might accumulate under certain conditions of opera tion oftheengine. r

. Under some conditions it may be desirable to group the fuel feedchamber of the apparatus with the engine structure, for example, at theforward end of an automobile, in order to render the chamber more easilyaccessible. Under such conditions the pipe 67 leading from the main fuelreservoir will be relatively long and will, therefore, contain a liquidcolumn of relatively high inertia. ,The repeated stopping and startingof this long column of fuel maytend to render more difficult the properfunctioning of the'fuel feed. 7

In Figures 6 to 8 I have illustrated a modified form of fuel feedingchamber which although capable of general use, has special advantages inenabling the fuel feeding chamber to be mounted near the enginestructure without involving the objections above referred to.

The form of fuel feeding chamber shown in Figures 6 to 8 may be providedwith a casing 50 provided with a pressure fuel feeding chamber 51similar to thechamber 51 previously described and also provided with afloat 52 and valve disc 53 and associated parts as previously describedin connection with Figure 2. shown, the fuel is fed from the chamber 51tothe carburetor float chamber 80 through an auxiliary chamber 105communicating with the chamber 51 through a port 106 having associatedtherewith a check valve 107. As shown the valve 107 is inthe form of aplate resting upon the walls of the port 106 and disposed beneath thelower openend of a tube 108 which communicates with the tube 7 9 wherebythe fuel is withdrawn from the bottom of the auxiliary chamber 105, atwhich point it is substantially free from air bubbles or other gases. 1

Although the fuel is intermittently withdrawn from the auxiliary chamber105 the fuel feeding chamber 51 and associated parts are so arrangedthat the feed of fuel thereto from the main source of supply 70 may,neverthless, be continuous. In the particular form of the inventionillustrated this result is secured by interposing between the to aflange'112 thereon by means of screws 113 to form a fluid tight jointand the fuel flows from the supplemental chamber 109 into the chamber51" through a screen 57 and disc valve 61 similar to the parts 57 and 61above described in connection with Figure 2.

Under the above conditions whena pres-- sure impulse is transmitted tothe chamber 9 51 through the pipe 18, fuel is delivered through the port106 past the valve 107 and through the tube 108 to the float feedchamber of the carburetor; and when a drop takes place in the pressureapplied to the chamber 51 the feeding of fuel to the. chamber stops.However, the above changes of conditions in the chamber 51 do notprevent the continuous and uniform flow of. fuel from the main source ofsupply 70 into the supplemental chamber 109, so long as the level of thefuel in the chamber 109 is below its top,

since pressure fluctuations are cushioned in the space in the chamber109 above the level of the fuel therein; thus the level of the fuel insuch chamber may change slightly due .to pressure variations, butnevertheless the flow of fuel into the chamber will be substantiallycontinuous and uniform, the supplemental chamber acting in effect as anelastic diaphragm which absorbs the pressure fluctuations withouttransmitting them to the column of fuel passing through the pipe 67.

As is above stated, these features become more valuable as the pipe 67is made longer. The casing 50 for example, may be pro? vided with aflange 114 to enable the same to be bolted to the gear case of anautomobile, or other convenient part which is readily accessible fromthe forward portion of the ve hicle and under such conditions if themain fuel supply reservoir is located at the rear of the vehicle thelength of the pipe 67 will usually be sufiicient to make desirable theuse of the features of the invention disclosed in connection withFigures 6 to 8. In this embodiment of the invention, furthermore, thefuel passes upwardly through the screen 57 tending to strain out thewater contained therein and the bottom of the reservoir chamher 109 maybe provided with a drain-plug 115, or the like, to enable water andother strained out material to be readily drained off.

Upon consideration of the structure described as related to the actionof the engine pressures derived at any given instance from one cylinderof the multiple cylinder engine running at high speed so that suctionimpulses follow each othe 1 in rapid succession, as, from ten to thirtyper second, it may be understood that starting with the entire course ofpressure and flow from the main tank, 70, to the engine empty of liquid,each suction impulse at the peak will take a little air from beyond thevalve, 61, the valve being immediately seated after each suction impulseand retaining the increment of vacuum produced in the passage beyond thevalve; and thus at each suction impulse an increment of vacuum will beadded, until the vacuum approximates the peak engine vacuum, or issufficient to lift the liquid to the top bend of the siphon whose downlimb is the pipe, 67, or to whatever distance may be necessary to causethe liquid to make the remainder of its course by gravity. And it willbe recognized that such action is due to the large area of the valve,61, relatively to its weight and the consequently short range ofmovement from its seat necessary to make the flow capacity of the gapbetween the valve and seat equal that of the port.

lVhile I have described my invention above in detail I wish it tobeunderstood that many changes may be made therein without departing fromthe spirit of the same.

I claim: A

1. In combination with an internal combustion engine a pressure chamberfrom which liquid fuel is supplied by pressure to the carbureter of theengine; a conduit through which the engine pressure is transmitted tosaid chamber; a valve in said conduit and yielding means holding itnormally open for pressure toward the pressure chamber adapted to beseated by pressure overcoming said yielding means, and means operated inthe seating of said valve for venting the pres sure previouslytransmitted past it before its seating.

which fuel is supplied to the carbureter of the engine by pressure, aconduit through which pressure is transmitted to said chamber from acylinder of the engine; means in said conduit operable by the pressuretherein for preventing the pressure beyond a predetermined degreereaching the pressure chamber, and other means operated by the firstmentioned means for venting the pressure previously transmitted, saidmeans being adapted to react upon the opposite or suction stroke ofpiston for admitting suction to said pressure chamber for drawing liquidsupply thereinto from the lower source, and means for admittingatmospheric air to the conduit in said suction stroke anterior to themeans in said conduit by which the transmission of pressure beyond apredetermined degree is prevented; whereby air is admitted more freelyon the suction stroke than gases are driven out on the pressure stroke.

3. In combination with an internal combustion engine a pressure chamberfrom which the liquid fuel is supplied by pressure to the carburetor ofthe engine, a conduit through which the engine pressure is trans mittedto said chamber and a valve in said conduit provided with means foryieldingly holding it normally open for pressure from the engine towardthe pressure chamber, an atmosphere inlet communicating with saidconduit between the engine and said valve and a check valve controllingsaid atmosphere inlet, adapted to be seated by pressure operatingthrough said conduit, whereby air is taken in substantially throughoutthe suction stroke and gas is driven out only through part of thepressure stroke.

4. In combination with an internal combus tion engine a pressure chamberfrom which liquid is supplied by pressure to the carburetor of theengine, a conduit through which the engine pressure is transmitted tosaid chamher; a valve in said conduit and yielding means holding itnormally open for pressure from theengine toward the pressure chamber; asecond valve member which is normally yieldingly seated to control theventing of the pressure transmitted past the first mentioned valve, saidsecond valve member being positioned for encounter by the firstmentioned valve in the seating movement of the latter, and moved forunseating to open the vent in the continuing movement of the firstmentioned valve after its seating.

5. In combination with an internal combustion engine a pressure chamberfrom which liquid fuel is'supplied by pressure to the carburetor of theengine; a conduit through which the engine pressure is transmitted tosaid chamber; a valve in said conduit and yielding means holding itnormally open for pressure from the engine toward the chamber; meansby'wliich engine suction is communicated to the pressure chamber in thesuction stroke of the engine through the same conduit throughwhich-pressure is transmitted in the opposite stroke; a source of fuelfor supplying the pressure chamber; a check valve controlling the inflowof fuel to the pressure chamber and seating to prevent backflow towardsaid fuel source; a float in the pressure chamber, and a valve operatedthereby for seating at the port of communication with said conduit uponthe liquid in the pressure chamber reaching a predetermined high level.

6. In an apparatus for the purpose indicated, a structure comprising aconduit from an engine cylinder to a fuel chamber; an intermediatechamber interposed in said conduit having its ports of communicationthere with in opposite walls; a disk device in said chamber dimensionedrelatively to the chamber for very short movement back and forth betweensaid opposite walls; means preventing said disk from seating to closethe port at the engine side of said intermediate chamber, said diskbeing dished at the opposite side for being stopped at its periphery bysaid opposite wall with said periphery encompassing the port in saidwall, said disk being very light relatively to its area exposed to thefluid pressure reaching it from the engine cylinder and dimensionedrelatively to said chamber for limited clearance for the passage of thepressure fluid around its periphery.

7. In an apparatus for the purposeindicated, a structure comprising aconduit from an engine cylinder to a liquidchamber; an intermediatechamber interposed in said conduit having ports of communication withthe conduit in its opposite walls; a disk in said chamber dimensionedrelatively thereto for very short. movement back and forth between saidopposite walls and for limitedclearance around its periphery for fluidpressure operating through said ports, said disk having associated withit valve means for controlling the port of said intermediate chamberopposite that through which said engine pressure reaches said chamber,and means for admitting atmospheric pressure to the disk at the sidethereof at which the last mentioned port is sit-uated.

8. In an apparatus for the purpose indicated, a structure comprising aconduit from an engine cylinder to a liquid chamber; an intermediatechamber interposed in said conduit having ports of communication withthe conduit in its opposite walls; a disk in said chamber dimensionedfor very short. movement back and forth between the opposite walls ofthe chamber and for limited clearance around its periphery for the fluidpressure obtaining access to said intermediate chamber; and meanspreventing said disk from seating to' close the port at the side of saidchamber toward the .engine; means associated with said disk for cuttingoff communication of said chamber with said port in the opposite wallwhen said disk has moved toward said opposite wall, and for stoppingsaid movement. of the disk, the conduit from the first mentioned liquidchamber being open for passage to said fuel chamber, of engine fluidpressures which have passed the disk when said disk is thus stopped inits movement away from the port of communication with the cylinder.

9. In an apparatus for the purpose indicated, a structure comprising apressurecommunicating passage between an engine cylinder and a fuelchamber, an intermediate chamber interposed in said passage having itsports of communication with said passage in opposite walls; a diskpositioned in said chamber and dimensioned relatively thereto for veryshort movement back and forth between said opposite walls and forlimited clearance for the pressure fluid around its periphery; meanspreventing said disk from seating to close the port of communication ofsaid intermediate chamber with the engine cylinder, said disk beingdished opposite said port for encompassing by the periphery of its dishfrom the port at that side, the construction being adapted for cuttingoh the pressure fluid communication past the periphery of the disk at aposition of the disk at. which communication is open from the dishedside of the disk to the fuel chamber. I

10. In an apparatus for lifting. liquid fuel for supplying an internalcombustion engine, in combination with a cylinder of the engine andconnected thereto for communication throughout the suction phase of theparticular cylinder so connected, a chamber to which the liquid fuel isto be supplied; a fuel source from which the fuel is lifted for flow tosaid chamber; the conduit from the source to the chamber connected fordelivery of the fuel upwardly into the cham-- ber, the chamber having arelatively large port of access for the fuel; a disk valve controllingsaid port light relatively to its area necessary for such control andformed relatively to said chamber so as to havenvery short range ofmovement to and from its seat, and diametered relatively to the chamberfor affording clearance for liquid flow around its periphery, and valvemeans interposed between the engine cylinder and the fuel chamber forcausing suction and pressure alternating in the cycle of the enginesaction to be communicated with like alterna tion to the fuel chamber;whereby the rapid succession of such impulses reaching the chamber nearthe suction peak in each engine cycle builds up the suction in theconduit from the fuel source to the fuel chamber from the initial zerotoward the peak suction.

11. In combination with a cylinder of an internal combustion engine, aconduit for transmission of engine pressures; a chamber comprised insaid conduit having in its opposite Walls ports of communication withthe remainder of the conduit; a disk device in said chamber dimensionedrelatively to the chamber for very short movement back and forth betweensaid opposite walls; means preventing said disk from seating to closethe port at the engine side of said chamber, said disk having means forbeing stopped by said opposite wall with its periphery encompassing theport in said wall, said disk being very light relatively to its area eX-posed to the fluid pressure reaching it from the engine cylinder, anddimensioned relatively to said chamber for limited clearance for thepassage of pressure fluid around its periphery.

12. In an apparatus for the purpose indicated, a structure comprising aconduit. from an engine cylinder to the fuel chamber; an intermediatechamber interposed in said con- -duit having ports of communicationthere With in its opposite walls leading respectively to the enginecylinder; and to the fuel chamber, a valve device controlling the portof communication with the fuel chamber comprising a disk in saidintermediate chamber dimensioned relatively thereto for very shortmovement back and forth between said opposite walls; means preventingsaid disk from seating to close the port at the engine side of saidintermediate chamber, said disk being formed for being stopped at itsperiphery by the wall at the opposite side with its said peripheryencompassing the port at that side, said disk being dimensionedrelatively to its chamber for substantial clearance for the passage ofthe pressure fluid around its periphery.

In testimony that I claim the foregoing, I have hereunto set. my handthis 24th day of July, 1923.

EDWARD A. ROCK'WELL.

